Question

How cani use below codes string id = ( from in …..) how?

using (StockProcedureDataContext stock = new StockProcedureDataContext())
            {


                id = (from m in stock.StockTools
                      from ss in stock.RefStockStatus
                      where (m.statusid == 3 || m.statusid == 5) &&
                      ss.id == m.statusid && m.id == ItemID
                      select m.id);

How can i do above wthout using below?

id = (from m in stock.StockTools
                      from ss in stock.RefStockStatus
                      where (m.statusid == 3 || m.statusid == 5) &&
                      ss.id == m.statusid && m.id == ItemID
                      select m).ToList()[0].id;

Answer 1

if you want to retrieve a single result user FirstOrDefault() or First().

If you use First() and the result is null.It will throws exception but not in FirstOrDefault().

var query = (from m in stock.StockTools
                      from ss in stock.RefStockStatus
                      where (m.statusid == 3 || m.statusid == 5) &&
                      ss.id == m.statusid && m.id == ItemID
                      select m.id).FirstOrDefault();